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An arrest for simple possession of a small amount of marijuana where only a fine was paid is not a mandatory blacklist for readmission to the country. Arrest and conviction for possession of marijuana of more than a small amount carries jail time and only the "potential" of being blacklisted for readmission to the country. Most times, if you are arrested in one of the small towns where you paid a fine and were released and you were not immediately escorted to the airport and deported, then you were not blacklisted and you can return to the country. When someone is arrested in Thailand for drug possession, if they are being blacklisted they are immediately deported.
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